Conn. Agencies Regs. § 19-13-B47
After November 15, 1948, in the case of construction of or repairs to any system of water supply furnished to the public, precautions shall be exercised in the handling, laying or installing of water pipe, valves or other structures through which water for potable purposes is delivered, so as to reduce to a minimum the entrance of foreign material and contamination, before such pipe, valves or other structures are placed in service. After said date no new main, standpipe, reservoir, tank or other pipe or structure through which water is delivered to consumers for potable purposes shall be put into service on any system of water supply furnished to the public, nor shall the use of any such structure or main be resumed after it has been cleaned or repaired, until such structure or main has been effectively disinfected; provided this shall not apply to mains, tanks, reservoirs or structures, the waters from which are subsequently adequately treated or purified.
Conn. Agencies Regs. § 19-13-B47